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C
atadioptric lenses are fundamentally resistant to chromatic aberrations because their optics mainly are reflective rather than refractive. But internal mirrors reflecting light create the dilemma of how to direct the radiation from the lens entrance to the sensor. Cats achieve this by reflecting the light from the back main objective mirror towards the front of the lens where it hits a second smaller center mirror which then reflects the light rearward. A hole in the main objective mirror allows the light to exit the lens and strike the sensor. The second small mirror and the hole in the main mirror act as light obstacles. This arrangement causes out-of-focus highlights to become ring shaped.
“My cameras are all of my own design. I take lenses apart and put them together again and put them on cameras that were not meant for them.” - Man Ray
